JP7125468B2 - 液晶ポリマーフィルム、及び液晶ポリマーフィルムから成る積層体 - Google Patents
液晶ポリマーフィルム、及び液晶ポリマーフィルムから成る積層体 Download PDFInfo
- Publication number
- JP7125468B2 JP7125468B2 JP2020210276A JP2020210276A JP7125468B2 JP 7125468 B2 JP7125468 B2 JP 7125468B2 JP 2020210276 A JP2020210276 A JP 2020210276A JP 2020210276 A JP2020210276 A JP 2020210276A JP 7125468 B2 JP7125468 B2 JP 7125468B2
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- Japan
- Prior art keywords
- lcp
- metal foil
- lcp film
- present application
- laminate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/38—Polymers
- C09K19/3804—Polymers with mesogenic groups in the main chain
- C09K19/3809—Polyesters; Polyester derivatives, e.g. polyamides
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- H—ELECTRICITY
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
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- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
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Description
1実施形態では、本出願のLCPフィルムの第1表面のSaは0.31μm以下であってもよい。別の実施形態では、本出願のLCPフィルムの第1表面のSaは0.30μm以下であってもよい。更に別の実施形態では、本出願のLCPフィルムの第1表面のSaは0.29μm以下であってもよい。また更に別の実施形態では、本出願のLCPフィルムの第1表面のSaは0.028μm以上であってもよい。その上更に別の実施形態では、本出願のLCPフィルムの第1表面のSaは0.028μm以上0.290μm以下であってもよい。更に追加する実施形態では、本出願のLCPフィルムの第1表面のSaは0.028μm以上0.289μm以下であってもよい。1実施形態では、本出願のLCPフィルムの第1表面のSa及び第2表面のSaは両方とも前述の範囲のいずれかに該当してもよい。本出願のLCPフィルムの第1表面のSa及び第2表面のSaは、必要に応じて同じであっても異なっていてもよい。1実施形態では、本出願のLCPフィルムの第1表面のSaと第2表面のSaとは異なる。
あるいは、LCPフィルムの第1表面のSzは、上記の値のうちの任意の2つの数値間の範囲内に該当してもよい。好ましくは、本出願のLCPフィルムの第1表面のSzは0.9μm以上であってもよく、より好ましくは、0.92μm以上であってもよい。従って、LCPフィルムを積層体に塗布することには、挿入損失が少なく、LCPフィルムと金属箔との剥離強度が向上するという利点がある。これらの利点により、その後の積層体の処理中のワイヤ剥離などの問題を回避できる。
別の実施形態では、本出願のLCPフィルムの第1表面のSzは7.30μm以下であってもよい。更に別の実施形態では、本出願のLCPフィルムの第1表面のSzは0.92μm以上7.30μm以下であってもよい。また更に別の実施形態では、本出願のLCPフィルムの第1表面のSzは0.921μm以上7.239μm以下であってもよい。1実施形態では、本出願のLCPフィルムの第1表面のSz及び第2表面のSzは両方とも、上述の範囲のいずれかに該当してもよい。本出願のLCPフィルムの第1表面のSz及び第2表面のSzは必要に応じて同じであっても異なっていてもよい。1実施形態では、本出願のLCPフィルムの第1表面のSzと第2表面のSzとは異なる。
接続層の材料は異なるニーズに応じて調整してもよい。例えば、接続層の材料は、耐熱性、耐薬品性、又は電気抵抗性などの機能を提供するために、ニッケル、コバルト、クロム、又はこれらの合金を含んでもよい。同様に、積層体中の第2金属箔は、直接又は間接接触法式でLCPフィルムの第2表面上に積層してもよい。本出願の1実施形態では、LCPフィルム及び第1金属箔の積層方法と、LCPフィルム及び第2金属箔の積層方法とは同じであってもよい。別の実施形態では、LCPフィルムと第1金属箔との積層法はLCPフィルムと第2金属箔との積層方法とは異なっていてもよい。
本明細書で提案した記述は、単に説明目的のための好ましい実施形態にすぎず、本出願の範囲を限定することを意図したものではない。本出願の精神及び範囲から逸脱することなく、本出願を実践又は応用するために様々な改変及び変更が可能である。
調製例:LCP樹脂
6‐ヒドロキシ‐2‐ナフタレンカルボン酸(440g)、4‐ヒドロキシ安息香酸(1145g)、無水アセチル(1085g)及び亜リン酸ナトリウム(1.3g)の混合物を3リットルのオートクレーブに入れ、アセチル化するために、常圧窒素雰囲気下、160℃で約2時間撹拌した。次いで、混合物を毎時30℃の加熱速度で320℃まで加熱した後、この温度条件下で、760トルから3トル以下へと徐々に減圧し、320℃から340℃へと昇温した。その後、撹拌力及び圧力を増加し、ポリマーを吐出する工程、ストランドを引き抜く工程、及びストランドをペレットへと切断する工程を行い、融点が約305℃、粘度が320℃で約40Pa・sのLCP樹脂を得た。
実施例1~12及び比較例1~5:LCPフィルム
調製例から得たLCP樹脂を原料として使用し、後述する方法により、実施例1~12のLCPフィルム(E1~E12)及び比較例1~5のLCPフィルム(C1~C5)を調製した。
本試験例では、実施例1~12及び比較例1~5のLCPフィルムを試験試料として用いた。各試験試料のいずれか一方の表面の面粗度、即ちSa及びSzをISO25178:2012に準拠して測定した。
前記方法に従って、E1~E12及びC1~C5の各LCPフィルムのいずれか一方の表面のSa及びSzの結果を以下の表2に収載する。
線粗度(例えば、Ra)と面粗度(例えば、Sa)との違いを調べるために、上記実施例及び比較例からE5、E6、及びC5のLCPフィルムを試験試料として無作為に選択した。JIS B0601:1994に準拠して、前記LCPフィルムのいずれか一方の表面の線粗度を求めた。また、ISO25178:2012に準拠して、前記LCPフィルムのいずれか一方の表面の面粗度を求めた。
Ra:E5<E6<C5・・・・・(式1)
Sa:E6<E5<C5・・・・・(式2)
複数のLCPフィルムのRaの昇順関係は、複数のLCPフィルムのSaの昇順関係とは明らかに異なっており、RaとSaとは互いから直接推量できないことが分かった。更に、これら3つのLCPフィルムの最大値及び最小値から推量した相対倍率によりRa又はSaの違いを調べた。C5のLCPフィルムのRa(3試料中最大Ra)はE5のLCPフィルムのRa(3試料中最小Ra)に近かったが、C5のLCPフィルムのSa(3試料中最大Sa)はE6のLCPフィルムのSa(3試料中最小Sa)の約1.7倍大きかった。この結果から分かるように、E5とC5のLCPフィルムのRaは近似していたが、E5とC5のSaの差は依然として大きかった。この結果から、RaとSaとは互いから直接推量できないことが証明された。
線粗度(例えば、Rz)と面粗度(例えば、Sz)の違いを調べるために、上記実施例からE1及びE12のLCPフィルムを試験試料として無作為に選択した。JIS B 0601:1994に準拠して、前記LCPフィルムのいずれか一方の表面の線粗度を求めた。また、ISO25178:2012に準拠して、前記LCPフィルムのいずれか一方の表面の面粗度を求めた。
実施例1A~12A及び比較例1A~5A:積層体
同種の市販銅箔に積層した実施例1~12及び比較例1~5のLCPフィルムから、実施例1A~12A(E1A~E12A)及び比較例1A~5A(C1A~C5A)の積層板をそれぞれ作製した。
具体的には、初めに、厚さ約50μmのLCPフィルム、及びそれぞれ厚さ約12μmの2枚の同一の市販銅箔を、それぞれ20cm×20cmのサイズへと切断した。次いで、LCPフィルムを2枚の市販銅箔で挟み、積層構造体を形成した。この積層構造体を、1平方センチメートル当たり5キログラム(kg/cm2)の圧力に180℃で60秒間供し、その後、20kg/cm2の圧力に300℃で25分間(min)供した後、室温まで冷却し、積層体を得た。各積層体に含まれるLCPフィルムを下記表5に収載する。
実施例1A~12A及び比較例1A~5Aの積層体をそれぞれ、長さ約10cm、幅約140μmのサイズ、抵抗値約50オーム(Ω)を有するストリップライン試験片へと切断した。ストリップライン試験片の挿入損失を、プローブ(メーカー:Cascade Microtech社、型式:ACP40‐250)を備えるマイクロ波ネットワーク解析機(メーカー:Agilent Technologies社、型式:8722ES)により、10GHzで測定した。積層体の結果を以下の表5に収載する。
積層体の剥離強度はIPC‐TM‐650の2.4.9に準拠して測定した。実施例1A~12A及び比較例1A~5Aの積層体をそれぞれ、長さ約228.6mm及び幅約3.2mmのサイズのエッチングした試験片へと切断した。各エッチング試験片を温度23±2℃及び相対湿度50±5%で24時間静置し、安定化させた。次いで、両面接着テープを用いて、各エッチング試験片を、試験機(メーカー:Hung Ta Instrument社、型式:HT‐9102)のクランプに接着した。その後、各エッチング試験片を剥離速度50.8mm/minの力でクランプから剥離し、剥離工程時の力の値を連続的に記録した。ここで、当該力は試験機が耐えられる力の15%~85%の範囲内に制御し、クランプからの剥離距離は少なくとも57.2mmを超すべきであり、初期距離6.4mmでの力は無視し、記録しなかった。結果を表6に示す。
Claims (5)
- 互いに相対する第1表面及び第2表面から成る液晶ポリマーフィルムであって、
前記第1表面の表面相加平均高さ(Sa)は0.028μm以上0.289μm以下であり、
前記第1表面の表面最大高さ(Sz)は0.921μm以上7.239μm以下であり、
前記第1表面のSa及びSzはISO25178:2012で定義することを特徴とする、
液晶ポリマーフィルム。 - 前記第2表面のSaは0.32μm未満であり、前記第2表面のSaはISO25178:2012で定義する、請求項1に記載の液晶ポリマーフィルム。
- 前記第2表面のSzは0.8μm以上であり、前記第2表面のSzはISO25178:2012で定義する、請求項1又は2に記載の液晶ポリマーフィルム。
- 第1金属箔、及び請求項1~3のいずれか1項に記載の液晶ポリマーフィルムから成る積層体であって、
前記第1金属箔は前記液晶ポリマーフィルムの前記第1表面上に配置することを特徴とする、
積層体。 - 前記積層体は更に第2金属箔から成り、前記第2金属箔は前記液晶ポリマーフィルムの前記第2表面上に配置する、請求項4に記載の積層体。
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